No, Graham is right on definition. NG-PON is understood to be a generational scale-up (4x for ITU, 10x for IEEE) in capacity, regardless of whether it is achieved in the time domain or the wavelength domain or both. In terms of ITU standardization, it would be better to speak of 5th Generation PON (S-PON, A-PON, B-PON, and G-PON being 1st through 4th generation, respectively).
I concur with Duh - Graham is using "NG-PON" the way I've been hearing people use the term.
Of course, that brings up the question of what to call the generation after NG-PON. NNG-PON?
Going off Duh's post, maybe 6th-G PON or something.